How to Interfacing with AC Power lines with PIC?

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rahul_sanghavi

Joined: 07 Dec 2004
Posts: 53

07 Apr 2005 9:16 microchip an521 interfacing to ac power lines

Hi.

I do ZCD for AC Power lines.
I read application note of Microchip AN521. This application note explain for interfacing AC Power lines directely connect with Microchip I/O Pin.

My Problem is they told Phase connect with I/O pin of microchip but they cannot mention what about connection nutral.

Is it required to connection of Nutral .?

Plz help me.

Regards
Rahul

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IanP

Joined: 05 Oct 2004
Posts: 6490
Helped: 1542
Location: West Coast

07 Apr 2005 10:28 Re: How to Interfacing with AC Power lines with PIC?

To close the loop you need to connect 0V to Neutral ..
Working with dengerous voltages without isolation is in my oppinion very risky practice ..
For measuring frequency, zero-crossing etc much safer solution will be to use a step-down transformer or an optocoupler ..